"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP

The dumb question of the day: There is a technical basis to use all these fixed 470 resistors and vary only the remaining components in each gyrator or just a designer choice? I mean, you could also set one value for all the bias resistors and so the other being those to be adjusted to the needs of each gyrator, so... is there any difference?

Duckman wrote:The dumb question of the day: There is a technical basis to use all these fixed 470 resistors and vary only the remaining components in each gyrator or just a designer choice? I mean, you could also set one value for all the bias resistors and so the other being those to be adjusted to the needs of each gyrator, so... is there any difference?

The 470 resistor sets the Q and gain of the gyrator, so, in order to have a similar Q on each band uses the same resistor. The GGG eq uses the same negative loop resistor and the same pull up to bias resistor and only changes the caps...

Duckman wrote:The dumb question of the day: There is a technical basis to use all these fixed 470 resistors and vary only the remaining components in each gyrator or just a designer choice? I mean, you could also set one value for all the bias resistors and so the other being those to be adjusted to the needs of each gyrator, so... is there any difference?

The 470 resistor sets the Q and gain of the gyrator, so, in order to have a similar Q on each band uses the same resistor. The GGG eq uses the same negative loop resistor and the same pull up to bias resistor and only changes the caps...

Yeah, I was checking that in every gyrator based EQ that I found in the net and seems like none of them are very picky about Q, so values can be very approximate, but nothing perfect. In fact, most of them uses a 1M pot in series with the bias resistor to vary the frequency, but that means a change in Q from 1 or 2 (up freq) to 4 or 7 (low freq) in some cases (depends on the arrangement of the gyrator)

Well, I contacted MXR/Dunlop about the broken slider and they promptly sent me a replacement slider!! My pedal wasn't even under warranty anymore, so they sure seem to care about customer satisfaction.

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